Condition responsive by-pass valve construction

ABSTRACT

A condition responsive by-pass valve construction having a housing provided with an inlet and two outlets interconnected to the inlet, the housing having a valve seat disposed between one of the outlets and the inlet. The housing carries a movable valve member for controlling the valve seat to provide substantially a linear percentage by-pass flow between the inlet and the one outlet as the valve member moves between a fully opened position thereof and a fully closed position thereof. The housing carries a condtion responsive device for controlling movement of the valve member. One of the valve seat and the valve member has tapered groove means for progressively bridging and unbridging the other of the valve seat and valve member to provide the substantially linear percentage by-pass flow.

This application is a divisional application of its copending parentpatent application, Ser. No. 800,300, filed May 25, 1977, now U.S. Pat.No. 4,133,349.

This invention relates to an improved condition responsive by-pass valveconstruction and method of making the same.

A condition responsive by-pass valve construction has been provided tocause substantially a linear percentage by-pass flow between an inletthereof and one of the outlets thereof as a valve member means of theconstruction moves between a fully opened position thereof and a fullyclosed position thereof, such construction having a sliding valve memberthat covers or uncovers a series of aligned bleed openings to providefor the linear percentage by-pass flow.

However, it has been found according to the teachings of this inventionthat a more accurate linear percentage by-pass flow can be provided ifone of the valve member means and the valve seat means therefor isprovided with tapered groove means for progressively bridging andunbridging the other of the valve seat means and the valve member meansto provide the substantially linear percentage by-pass flow.

In particlar, one embodiment of this invention provides a conditionresponsive by-pass valve construction having a housing means providedwith an inlet and two outlets interconnected to the inlet, the housingmeans having a valve seat means disposed between one of the outlets andthe inlet. The housing means carries a movable valve member means forcontrolling the valve seat means to provide substantially a linearpercentage by-pass flow between the inlet and the one outlet as thevalve member means moves between a fully opened position thereof and afully closed position thereof. The housing means carries a conditionresponsive means for controlling movement of the valve member means. Oneof the valve seat means and the valve member means has tapered groovemeans for progressively bridging and unbridging the other of the valveseat means and the valve member means to provide the substantiallylinear percentage by-pass flow.

Accordingly, it is an object of this invention to provide a conditionresponsive by-pass valve construction having one or more of the novelfeatures of this invention as set forth or hereinafter shown ordescribed.

Another object of this invention is to provide a method of making such acondition responsive by-pass valve construction, the method of thisinvention having one or more of the novel features of this invention asset forth above or hereinafter shown or described.

Other objects, uses and advantages of this invention are apparent from areading of this description which proceeds with reference to theaccompanying drawings forming a part thereof and wherein:

FIG. 1 is a perspective view of the condition responsive by-pass valveconstruction of this invention.

FIG. 2 is an enlarged cross-sectional view taken on line 2--2 of FIG. 1.

FIG. 3 is a cross-sectional view taken on line 3--3 of FIG. 2.

FIG. 4 is an enlarged fragmentary view similar to FIG. 2 and illustratethe condition responsive by-pass valve construction in an intermediateoperating condition thereof.

FIG. 5 is a view similar to FIG. 4 and illustrates another embodiment ofthe condition responsive by-pass valve construction in an intermediateoperating condition thereof.

While the various features of this invention are hereinafter describedand illustrated as being particularly adapted to provide a temperatureoperated by-pass valve construction, it is to be understood that thevarious features of this invention can be utilized singly or in anycombination thereof to provide a by-pass valve construction operated byother means as desired.

Therefore, this invention is not to be limited to only the embodimentsillustrated in the drawings, because the drawings are merely utilized toillustrate one of the wide variety of uses of this invention.

Referring now to FIGS. 1, 2 and 3, the improved condition responsiveby-pass valve construction of this invention is generally indicated bythe reference numeral 10 and comprises a housing means 11 having achamber 12 therein and a pair of nipples 13 and 14 respectively havingpassage means 15 and 16 therein leading to the chamber 12.

The passage 15 can comprise an inlet to the chamber 12 and has arestriction or orifice 17 therein whereby the inlet 15 is adapted to beinterconnected by suitable conduit means 18 to a fluid supply means 19while the other passage 16 can comprise an outlet that is adapted to beinterconnected by suitable conduit means 20 to a fluid utilizing means21, such as a pneumatically operated control device or the like.

The chamber 12 of the housing means 11 has annular valve seat means 22therein that leads from a larger cylindrical part 23 of the chamber 12to a smaller coaxial cylindrical part 24 of the chamber 12 asillustrated, the inlet 15 and outlet 16 both being interconnected to thelarger section 23 of the chamber 12 as illustrated.

The smaller cylindrical section 24 of the chamber 12 leads to theatmosphere through a vent outlet 25 and can have suitable filtermaterial 26 disposed therein, if desired.

An axially movable substantially cylindrical valve member 27 is disposedfor movement in the chamber 12 and has a forward portion 28 through thevalve seat means 22 to control the same in a manner hereinafterdescribed, the forward portion 28 of the valve member 27 having anannular groove 29 therein receiving an annular resilient O-ring member30 which is adapted to slide in sealing engagement with the internalperipheral surface 31 of the housing 11 that defines the smallercylindrical section 24 of the chamber 12 thereof. Thus, when the O-ring30 is to the left of the groove means 22 as will be apparenthereinafter, the O-ring member 30 completely blocks and closes the inlet15 from the outlet 25 so that approximately 100% of the fluid enteringthe chamber 12 through the inlet 15 is adapted to pass out through theother outlet 16 to the utilization device 21 as will be apparenthereinafter.

The righthand end 32 of the valve member 27 is enlarged and isinterrupted by a bore 33 which receives a piston member 34 of atemperature responsive piston and cylinder device that is generallyindicated by the reference numeral 35 and which is carried by thehousing means 11 as illustrated.

A compression spring 36 is disposed in the chamber 12 and has one end 37bearing again an annular shoulder 38 of the housing 11 that is formedbetween the cylindrical sections 23 and 24 thereof and has the other end39 thereof bearing against the enlarged end 32 of the valve member 27 totend to urge the valve member 27 to the right in FIG. 2 so that theclosed end 40 of the bore 33 of the valve member 27 is maintained inabutment against the end 41 of the piston 34 of the temperatureresponsive device 35 whereby the position of the valve member 27 in thehousing means 11 is determined by the temperature responsive device 35in a manner hereinafter described.

The temperature responsive device 35 has a cylinder part 42 thatreceives the piston member 34 therein whereby a wax charge or the likein the cylinder member 42 acts on the piston 34 to extent the same tothe left in FIG. 2 as the temperature of the wax charge increases toexpand the wax charge and as the temperature of the wax chargedecreases, the wax charge contracts and the force of the compressionspring 36 moves the piston member 34 to the right in a manner well knownin the art.

The annular valve seat means 22 of the housing means 11 has a pluralityof tapering grooves 43 formed therein in a circular array and each beingangled toward the longitudinal axis of the valve member 27 to intersectthereon at a point that is disposed between the valve seat means 22 andthe outlet 25, each groove 43 having an arcuate wall 44 throughout thelength thereof as illustrated in FIG. 3 whereby the right hand part 45of the cylindrical peripheral surface 31 of the housing means 11 isinterrupted by the circular array of grooves 43 to permit the openingand closing of the valve seat means 22 by the valve member 27 to providea substantially linear percentage by-pass flow between the inlet 15 andthe outlet 25 as the valve member 27 moves from a fully opened positionto a fully closed position in a manner now to be described.

During the operation of the condition responsive by-pass valveconstruction of this invention, should the temperature being sensed bythe device 35 be below a certain temperature whereby the wax chargetherein is in its fully contracted condition and the compression spring36 has moved the valve member 27 to the right so that the O-ring 30thereof is to the right of the valve seat means 22, substantially 100%of the fluid entering the chamber 12 through the inlet means 15 isadapted to be by-passed by the fully open valve seat means 22 to theoutlet 25 whereby substantially zero percent of the fluid in the chamber12 is directed out of the outlet 16 to the utilization device 21.

However, as the temperature of the device 35 linearly increases from acertain value to another certain higher value, the wax charge in thedevice 35 expands and moves the valve member 27 to the left inopposition to the force of the compression spring 36 to cause the O-ring30 thereof to progressively move from the right hand end of the groovedportion 45 of the valve seat means 22 to the left hand part thereof toprogressively close off the grooves 22 in the manner illustrated in FIG.4 and thereby decrease the amount of fluid flow from the chamber 12therethrough in substantially a linear manner. Thus, when the O-ring 30reaches the left hand end of the grooved portion 45 of the valve seatmeans 22, the valve seat means 22 is completely closed so that no fluidis directed from the inlet 15 to the outlet 25 and substantially 100% ofthe fluid from the inlet 15 is directed by the outlet 16 to theutilization device 21.

Conversely, as the temperature of the device 35 decreases, the valvemember 27 is moved from the position illustrated in FIG. 2 to the rightto progressively open the grooved portion 45 of the valve seat means 22to increase the amount of interconnection between the inlet 15 and theoutlet 25 in substantially a linear manner.

Thus, in the above example of the condition responsive by-pass valveconstruction 10 of this invention, the temperature responsive device 35has been so selected that the same provides a decreasing by-pass flow tothe outlet 25 as the temperature thereof increases through a certaintemperature range so that at approximately the lowest temperature of thecertain temperature range, the valve member 27 has its O-ring 30 to theright of the grooved portion 45 of the valve seat means 22 to causesubstantially 100% of the fluid in the inlet 15 to be by-passed to theoutlet 25 whereby substantially zero percent of the fluid from the inletmeans 15 passes through the other outlet 16 to the utilization device21. However, as the temperature of the device 35 increases fromsubstantially the lowest temperature of the certain temperature range toapproximately the highest temperature of the certain temperature range,the valve member 30 is progressively moved from the right hand portionof the grooved part 45 of the valve seat means 22 to the left hand partthereof so that the percentage of fluid by-passed from the inlet 15 tothe outlet 25 is linearly decreased and the amount of fluid beingadapted to pass to the outlet 16 and, thus, to the utilization device 21increases substantially linearly until at approximately the highesttemperature of the certain temperature range, substantially 100% of thefluid from the inlet 15 passes to the utilization device 21 and thevalve seat means 22 is completely closed by the valve member 27 havingits O-ring 30 completely closing off the grooved portion 45 of the valveseat means 22 from the outlet 25.

Therefore, it can be seen that the condition responsive by-pass valveconstruction 10 of this invention provides substantially a linearpercentage by-pass flow between the inlet 15 and the outlet 25 as thevalve member 27 moves between a fully opened position thereof and afully closed position thereof.

While the valve construction 10 of this invention has been described ashaving the tapering grooves 43 formed in the valve seat means 22thereof, it is to be understood that the tapering grooves could beformed in the valve member rather than in the valve seat means thereof.

For example, another condition responsive by-pass valve construction ofthis invention is generally indicated by the reference numeral 10A inFIG. 5 and parts thereof similar to the valve construction 10 previouslydescribed are indicated by like reference numerals followed by thereference letter "A".

As illustrated in FIG. 5, the cylindrical portion 24A of the housingmeans 11A is provided with an annular groove 47 therein which receivesan annular resilient O-ring member 48 that projects inwardly from theinternal peripheral surface 31A of the housing means 11A to contactagainst the outer cylindrical peripheral surface 49 of the axiallymovable valve member means 27A to be opened and closed thereby.

The left hand portion 28A of the valve member means 27A is provided witha plurality of circularly arranged grooves 43A that taper at an anglerelative to the longitudinal axis of the valve member means 27A asillustrated in FIG. 5 so that the grooves 43A will be progressivelybridging and unbridging the O-ring valve seat member 48 in the samemanner that the grooves 43 of the valve seat means 22 were progressivelybridging and unbridging the resilient member 30 of the valve member 27to provide substantially a linear percentage flow between the chambersections 23A and 24A for the reasons previously set forth.

Therefore, it can be seen that either the valve member means or thevalve seat means of the condition responsive by-pass valve constructionof this invention can be made with the tapering groove means to providefor the substantially linear percentage by-pass flow between the inletof the valve construction and one of the outlets thereof as the valvemember means moves between a fully opened position of the valve seatmeans and a fully closed position of the valve seat means for thereasons previously set forth.

Thus, this invention not only provides an improved condition responsiveby-pass valve construction, but also this invention provides a method ofmaking such a condition responsive by-pass valve construction.

While the forms and methods of this invention now preferred have beendescribed and illustrated as required by the Patent Statute, it is to beunderstood that other forms and method steps can be utilized and stillfall within the scope of the appended claims.

What is claimed is:
 1. In a condition responsive by-pass valveconstruction having a housing means provided with an inlet and twooutlets interconnected to said inlet, said housing means having anannular valve seat means disposed between one of said outlets and saidinlet, said housing means carrying a movable valve member means forcontrolling the flow of fluid through said valve seat means to providesubstantially a linear percentage by-pass flow between said inlet andsaid one of said outlets as said valve member means moves between afully opened position thereof and a fully closed position thereof, saidvalve member means having a cylindrical portion interconnected to afrusto-conical portion that has a flat end surface, said cylindricalportion being adapted to sealing engage said annular valve seat means tofully close the same, said housing means carrying a condition responsivemeans for controlling movement of said valve member means, theimprovement wherein said valve member means has groove means in saidfrusto-conical portion thereof to intersect with said flat end surfaceand said cylindrical portion thereof for progressively bridging andunbridging said valve seat means to provide said substantially linearpercentage by-pass flow.
 2. A valve construction as set forth in claim 1wherein said valve seat means carries a resilient member to be bridgedand unbridged by said groove means.
 3. A valve construction as set forthin claim 2 wherein said groove means comprises a plurality of spacedapart grooves.
 4. A valve construction as set forth in claim 3 whereinsaid plurality of grooves are disposed in a circular array.
 5. A valveconstruction as set forth in claim 4 wherein said resilient membercomprises an O-ring.
 6. A valve construction as set forth in claim 4wherein said grooves all angle toward a common point.
 7. A valveconstruction as set forth in claim 6 wherein said grooves angle towardsaid one of said outlets.
 8. A valve construction as set forth in claim1 wherein said valve member means comprises an axially movable plungeradapted to slide partly through said valve seat means as said plunger ismoved along a longitudinal axis thereof.
 9. A valve construction as setforth in claim 8 wherein said groove means is angled relative to saidlongitudinal axis.
 10. A valve construction as set forth in claim 9wherein said groove means comprises a plurality of spaced apart groovesdisposed in a circular array and each being angled at the same anglerelative to said longitudinal axis.